Check-valve.



J. F. ROBERTSON.

CHECK VALVE.

APPLICATION FILED JAN. 16, 1911.

Patented M 1913.

2 SHEETS-SHEET 1 Eli iiiiiliillilll MI I s E s s E N u w J. F.ROBERTSON.

' CHECK VALVE. APPLICATION FILED JAN.16, 1911 Patented Jan. 7, 1913.

2 SHEETSSHBBT 2.

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CHECK-VALVE.

Specification of Letters Patent.

Patented J an. 7, 1913.

Application filed January 16, 1911. Serial No. 602,967.

To {ZZZ whom it may concern:

Be it known that 1, JOHN F. Ronnnrson, a citizen of the United States ofAmerica, residing at Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inCheck-Valves, of which the following is a specification, reference beinghad therein to the accompanying drawing.

This invention relates to check valves, and the invention has for itsobject to provide a valve of the above type with novel gravity seatingvalvular members capable of being unseated by a head or pressure ofwater, steam or air, the valvular members being arranged in a manner aswill be hereinafter set forth whereby they are intermittently rotated,thereby insuring an equal wear of said members and a positive seating,thus producing a valve that is positive in its action, free from injuryby ordinaryvuse and highly efficient for the purposes for which it isintended.

A further object of the invention is to provide a valve of the abovetype consisting of comparatively few parts, easily and quickly assembledand maintained in an operatable condition, the valve being designed uponcertain lines that add individuality to the same whereby it can bereadily distinguished among other valves installed upon steam, air orwater lines.

With these and such other objects in view as may hereinafter appear, theinvention consist-s of the novel construction, combination andarrangement of parts to be hereinafter specifically described and thenclaimed.

Reference will now be had to the drawings forming part of thisspecification, wherein there are illustrated the preferred embodimentsof the invention, but it is to be understood that the structuralelements thereof can be varied or changed without departing from thespirit and scope of the invention.

In the drawings :Figure 1 is a side elevation of a valve in accordancewith this invention, Fig. 2 is a longitudinal sectional view of thesame, showing the valvular members seated, Fig. 3 is a cross sectionalview of the valve, Fig. l is a longitudinal sectional view of a modifiedform of valve, Fig. 5 is a horizontal sectional view of a retainingmember forming part of the valve, Fig. 6 is a horizontal sectional viewof a portion of a valve illustrating a seat for the valvular members,Figs. 7 to 9 inclusive are plans of the valvular members, and Fig. 10 isa cross sectional view of one of the spokes of the horizontal partitionof the valve body.

Like numerals of reference designate corresponding parts throughout theseveral views.

1 denotes a valve body having an exterior shape hexagonal or octagonalin cross section, the ends of the body terminating in enlargements 2 ofa similar shape, this particular appearance of the valve bodydistinguishing it from other types of valves, particularly those havingglobular bodies. he valve body 1 is provided with a longitudinal bore 3,the walls of said bore at the ends thereof being threaded, as at twhereby pipes can be connected to the valve body. The bore 3intermediate the ends of the valve body is divided by a horizontalpart-ition 5, one end of the partition being formed integral with thevalve body by a web 6 and the opposite end by a web 7, said webstogether with the partition 5 dividing the valve body into practicallytwo compartments, the lower compartment receiving the water, steam orair and the upper compartment discharging the same. The partition 5 isprovided with a plurality of segmentshaped equally spaced openings 8leaving spokes 9 supporting the central portion of the seat, the spokes9 constituting a web that allows the contents of the lower compartmentof the valve body to pass into the upper compartment. The spider or theopenings 8 are surrounded by a circumferentially arranged groove 10formed in the upper face of the seat 5, said groove providing a waterseal or connection in conjunction with certain valvular members to behereinafter described.

The top of the valve body has an annular enlargement 11 providing anopening communicating with the upper compartment of the valve body, andthe walls of the opening are threaded, as at 12 to receive the annularexteriorly threaded depending flange 13 of a hollow cap 14 adapted toseat upon the upper edges of the enlargement 11, the top of said caphaving'a central square or hexagon shaped nut 15 adapted to facilitatethe removal of the cap 14: from the valve body. The depending flange 13has a transverse web 16 and this web intermediate the ends thereof isprovided with a depending stem 17, the lower end of which is tapered, asat 18 to engage in a socket 19 provided therefor centrally of thepartition 5. The stem 17 intermediate the ends thereof has a guard orretaining member, comprising a hub portion 20, spokes 21 and a rim 22,said guard or retaining member being approximately the same diameter asthe spider of the partition 5.

Surrounding the stem 17 are superimposed valvular members, consisting ofdisks 28, 24L and 25, the former being of a less diameter than thelatter, the disks being stepped in size and arranged with the disk 25 toseat directly upon the partition 5 with the disk 24. next and the disk23 resting upon the disk 24. The disk 25 contiguous to the peripherythereof is provided with a plurality of circumferentially arrangedopenings 26, these openings being drilled at an angle. The disk 24 alsohas angularly disposed openings 27, but the openings 27 are disposedwherehy they cannot register with the openings 26, as best shown inFigs. 2 and 3 of the drawings. The openings are disposed at an angle,whereby the pressure of water, steam or air will have a tendency torotate said disks and thereby insure an equal wear of the disks upon thepartition 5 and upon one another.

When the pressure of water, steam or air in the upper compartment of thevalve body is released, the pressure of the water, steam or air in thelower compartment of the body immediately elevates the disks 23 to 25inclusive, and the upward movement of these disks are limited by theguard or retaining member of the stem 17. These disks seat by gravity,and by back pressure of air or liquids, and since the cap 14- can beeasily removed, the disks can be renewed from time to time.

In Fig. l of the drawings there is illustrated a modification of theinvention wherein the partition 5 is provided with a post 5* over whichthe disks 23 to 25 are mounted, said post supporting the lower end ofthe stem 17, which in the modified form of construction is of lesslength than in the preferred form of construction. The post 5facilitates the placing of the valvular members in position, and themodified form of construction the same in operation, as the preferredform of construction.

In Fig. 10 of the drawings there is illustrated a cross sectional viewof one of the spokes or spider of the horizontal partition 5, and it ispreferable to make these spokes with the upper and lower edges thereofreduced to deflect the water, steam or air toward the valvular members.

As will be seen, the members 23, 2-1 and 25 are freely movable axiallyon the support or stem provided by the member 17 or 5 said members beingheld to the seat by reason of the pressure on the outlet side of thevalve and by gravity or the weight of the members themselves, the inletpressure, however, being on the member 25 throughout the strface lyingover the openings in the spider of the partition 5, and on the member 24on the surface overlying the openings in the member 1V hen, therefore,the pressure on the outlet side of the valve is relieved, there is atendency for the members 24- and 23 to be slightly raised initially,thus providing sufiicient fluid between the members 25 and 2% to causethe member 25, which immediately follows, to force the :tluid throughthe openings of member to cause the member 23 to be raised, theinclination of the openings causing the necessary and desired shittingmovement pivotally of the members. Inasmuch as the pressure is mainly onthe member 25, by reason of its relatively large exposed surface, itwill be obvious that its movements will be rapid with the result thatthe movements of the member 24 and 28 must be made with greater rapidityfor a time neces sary to provide the fluid to perform the desiredshifting; hence the rapid reduction in weight of the members produced bythe relatively smaller diameters of the members, and the elimination ofback pressure, such as would be provided by spring supports for themembers, is of the greatest importance in check valve construction wherethe operations are required to be sudden, rapid and accurate; this willbe obvious from the fact that as soon as the pressure of the inlet sideis relieved by the movement of valve member 25 from its seat, thepressure on member 24 through the openings of member 25, is re duced tosuch an extent that substantially no action would be provided.

What I claim is 1. A check valve comprising a casing having an inlet andan outlet and further having an opening, a flanged cap for closing saidopening and provided with a web integral with the flange, ahorizontally-disposed partition arranged within said casing andproviding a pair of compartments, said partition formed with a pluralityof equally spaced openings, superimposed valvular members seated uponsaid partition and adapted to close said openings, certain of saidmembers provided with means to cause a rotative movement thereof whenshifted from said partition, a stem integral with said web andprojecting through said members centrally and extending into saidpartition, said stem maintaining the first members in position over saidpartition, and laterallyextending means integral with the stemintermediate the ends thereof for limiting the opening movement of saidvalvular members.

2. A check valve comprising a casing having a horizontally disposedpartition provided with openings, thereby forming a pair ofcompartments, superimposed valvular members seated upon said partitionand adapted to close said opening, a cap detachably connected to thevalve body, a depending stem projecting from the cap and terminating atsaid partition, said stem extending centrally through said members formaintaining them in position over said partition a hub intermediate theends of said stem, spokes projecting from said hub, a rim integral withthe spokes, said hub, spokes and 10 rim constituting a guard forlimiting the opening movement of said members.

In testimony whereof I atfix my signature in the presence of twowitnesses.

JOHN F. ROBERTSON. Witnesses:

A. KALBAOK, MAX H. SRoLovrrz.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

